Improvement in magneto-electric dial-telegraphs



G. L. ANDERS.

2 Sheets,Sheet 1.

Dial Telegraph. No. 113,240/

Patented April 4, 1871.

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2 Sheets Sheet 2.

G. L. ANDERS. Dial Telegraph.

Patented April .4, 1 871 III Ill- 5:

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GEORGE L. Aspens, OF BOSTON, Assrenor. ro E. .B. WELGH, or CAMBRIDGE, MASSACHUSETTS. 4

IMPROVEMENT m MAGNETO-ELECTRIC.DlAL-TELEGRAPHSQ Specification forming part of LettersPatent N0. 1 13,240, dated April 4, 1871.

To all whom it may concern.-

Be it known that I, GEO. L. ANDERS, at present residing in Boston, Massachusetts, have inventedlcertain Improvements in Magneto-Electric Dial-Telegraps; and I do hereby declare that the following is a full, clear, and exact description of the same,reterence being had to the accompanying drawingsand letters of reference marked thereon, making apart of this specification, in whicht Figure 1 a perspective view of my invention. Fig. 2 is a plan view of the cap of indicator 1), inverted. Figs. 3 and 4; are sectional views of the indicator 1), showing side elevations of the interior. Fig. 5is a side elevationwith the key-board and top casing removed. Fig. 6 is a transverse-vertical section through line at m, Fig. 5; and Figs. 7, 8, 9, and 10, views of parts in detail.

This invention relates to magneto-electric dial-telegraph instruments of the step-bystep description, wherein keys are employed to select the letters and characters to be indicated, its object being to obviate the use of the old arrangement of keys, which are located radially around the dial, and to facilitate the operation of selecting said letters and it consists mainly in the combination of a magneto-generator with a drum fitted loosely on a shaft or arbor, revolved by suitable gearing,

' and provided on its periphery with a line of radial pins or projections running spirally from end to end thereof.

It also consists of a series of catch-springs under said drum, operated by a straight bank of keys, similar to those of the pianoforte, in such manner that each key raises a spring which engages with one of the, pins on the drum and arreststhe revolution of the same, said drum being connected to its revolving shaft'or arbor by a ratchet-and-pawl arrangement, similar to that employed in the magneto of Prof. Wheatst0ne,.whereby the connection between the drum and arbor is maintained, and

the drum revolved until the motion of the latter is arrested by the means before mentioned, when said connection ceases, and the arbor revolves without the drum until the same is released, when the connection is resumed.

It also consists in a contact pin or lever,

located on the arbor of: the drum, and other details of construction, which will be more fully.describedhereinafter.

1n the drawings, A represents the magnetogenerator, which is located within the case A,- and consists of the horseshoe-magnets a a a,

between the poles of which is a revolving armature, B. i

The armature B is located on a shaft, b, which has an insi'llated bearing, A and is revolved by. a belt passing over pulley G from .drive-wheel c, this latter being operated by a crankor treadle, as desired.

V The shaft b is provided with apinion, D, which meshes with cog-wheel d, which has its bearings in the top of case A its shaft being in turn provided with a'pinion which meshes with the cog-wheel E, which latter is loosely vstandards F F on the top of case A On the shaft 0 isa drum, G, which is fitted loosely thereon, composed of india-rubber or other like material, and provided with a line of radially-projecting pins, f, running spirally from end to end of the drum.

Immediately'under drum G is a metallic spring-plate, G ,c01'1structedlike a comb, with teeth or springs g, attached to a plate, G over the uppersurface of case A saidsprings having their ends bent upward to form catches. i

The springs g are so located with relation to pins f that each spring, when raised, will catch one of said pins and suspend the revolution of drum G; the raising of the springs being effected by a bank of keys, H, which are similar to those of a piano-forte, each key, when depressed, raising a corresponding spring. a

The shaft 6 is provided with aratchet, I, which, with the cog-wheel E, isattached to a sleeve, 0, which turns loosely on shaft 6 near one end of drum G, between which and the ratchet I is an arm,-i, which is rigidly attached to shaft 0.

To the arm 11 is pivoted a pawl, J, which is arm j of pawl J, and allow the same to have sleeved on shaft 0, which has its hearings in and pawls t, to escape-wheel ed by wire W,'pillar Q, and wire W a limited play between them. The arm j is provided with a spring, j, which bears against fii-iger k, while a spring, L, on arm 'i'bears against the opposite side of arm j.

'Near the opposite end of drum G is a metal disk, 1, which is loosely located on shaft c and provided with an arm or lever, M, the end of which projects between the ends of standard m and insulated plate N, the insulation of the latter being efl'ccted by a layer of rubber between itself and standard m, as shown in Fig. 8.

Between the disk 1 and the end of drum G is adisk of leather, n, and another metal disk, 0, which is provided with a spring which presses disks n 0 against disk Z, which, when revolved, exert sufficient friction against disk l-which is prevented from revolving by the 'contact of lever M with plate N-to secure a positive reaction of the lever when the drum ceases its motion, thereby securing a positive change of contact from the plate N to stand- -'ard 'n, and also securing the efficient operation of the ratchet-and-pawl arrangement I, J, 860.,

atthe opposite end of the drum G.

On the upper surface of casing A is a disk or casing, P, which incloses the keyboard-and other mechanism. 0n the casing P is located I an indicatonp, which consists of a cylindrical metallic case pivoted between metallic pillars and provided at its upper end with a dialplate containing the characters, figures, &c., and a pointer or index, are helices It R, having armatures r1", between which is a vertical bifurcated lever,S, pivoted at its lower end, its bifurcations embracing ahorizontal bifurcated lever, T,which is pivoted to the under surface of-the cap of case p, as shown in Fig. 2, and provided with pawls t t, which bear against the ratchet U, which is located on the shaft of the index (1, the same being operated by the vibration of lever S between armatures r, caused by the alternation of currents through helices R, said vibrations being imparted, through lever T The helix It is connected by wire V, pillar Q, and wire V with the distant indicator or with the ground, while the helix R'is connectto the insulated plate N. The shaftB, which has an insulated bearing at A is connected to standard m by wireX, and the latter with the ground by wire Y. The standards F F are located on a metallic plate, Z, which,with the arbor e,

' forms a conductor from end to end of the ma chine.

OperationrThe magneto current is gener-' pressed, thereby releasing the last key, marked stop, which, when in its natural position, acts to raise its spring 9 and detain the drum q. -Within the case}? H which had been G,which now commences its revolution, and the current passes through indicator 10, which current, passing through helices R R, imparts a vibratory motion to lever S, which communicates said motion to lever T, which revolves escape-wheel U, and operates the hand q of the indicator.

The revolution of the drum is effected by the spring L pressing the armj of pawl J forward, and causing the latter to bear upon the periphery of the ratchet-wheel I, and engage with the teeth of the same, thereby connecting the drum with the shaft; but when the motion of said drum is arrested, the finger k ofarm K is caused, by the reaction of the.

drum, as before mentioned, to force the arm j backward, thereby raising pawl J, and clearing the same from the teeth of ratchet I.

When the motion of the drum is arrested, the contact-lever M, which was in contact with the insulated plate N, drops on the contact standard m, thereby breaking the current through the indicatorp, suspending the vibration of levers S T and revolution .of the escapewheel U, which causes the needle or pointer to stop at the letter corresponding to the key depressed.

The desired letter being thus indicated at every depression of a key, and the consequent raising of one'of the springs g, the indicator points out the letter, while the same function is performed on the distant indicator on well-known principles.

The pressure being removed from that key depressed, the spring .9 which had arrested the drum Gr resumes its former position by its own elasticity, and releases said drum, which is revolved slightly by means of the friction exerted by disks n 0, this slight motion being sufficient to cause the arm-K'of drum G to come in contact with the arm j of pawl J, thereby imparting suffi cient motion to the same to engage said pawl with the ratchet I, which causes the drum to revolve until again arrested, as above described.

The springs of plate G perform three functions-as springs for the keys H, as springs for the catches formed by bending their ends,

and as catches for detaining the drum G, as

described.

The advantages of this arrangementare the facility and ease with which it is worked, the operator being enabled to sit at the machine and manipulate the keys and work the treadle or crank at the same time, without obstructing his view of the dial, while by the use of the straight key-board the whole mechanism is enabled to be covered by the disk-shaped casing P, which, when closed, is of great convenience to the operator in copying.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. The drum G, composed of rubber .or other like material, provided with the pins f, ararranged spirally, in combination with the spring-plate G and keys H, all arranged and 5. The combination, with a magneto-elecoperated substantially as described. tric dial-telegraph, of a straight key-board, H.

2. The drum G,, provided with arm K, hav- In testimony whereof I have signed my name ing fingers k k, in' combination with arm a, to this specification in the presence of two pawl J arm j, springs L j, and ratchet 1, subsubscribing witnesses. stantially as described.

3. The drum G, in combination With friction- GEO. L. ANDERS. disk I, and its operating-lever M, substantially as described. Witnesses: 1 4. The spring-plate G provided with catch CARROLL D. WRIGHT, A

7 springs g, substantially as set forth. O. F. BROWN- 

